−22−
6.3.6 Precautions on data processing
(1) Since the measured data and decimal places are assigned to separate numbers, it is necessary to
use both parts of the information when playing back the data. The decimal place of each data is
showed on the reference table. There are some types of data, which are fixed decimal place,
followed by each measuring range, (See paragraph 6.8), followed by linear decimal place setting.
Pay attention to the decimal place, when you replay the data.
(2) Since data is accessible (changeable) one by one, care must be taken when programming related
data, for instance when initializing related data by changing the range number. Processing details
are given in the Reference No. list.
(3) Read or write the data within the range of Reference Nos. specified. If data is written on any non-
specified Reference No., it is likely to affect the proper operation of the instruments.
(4) While it is possible to write data on two or more discreet Reference Nos., a start number with
Reference No. not specified will result in an error (error No. 02H).
(5) When reading two or more Reference Nos., the data with non-specified Reference No. becomes
“0”.
(6) When an error is detected during writing on two or more Reference Nos., all the programming
becomes invalid.
6.4 Creating a Message
A message consists of (1) Slave address, (2) Function code, (3) Data section and (4) Error check
code. (See Section 6.3)
The message readable or writable at one time is within the following range.
Number of data pieces
function code
ASCII RTU
01 1 1
02 121 121
03
13 26
04
13 26
15 1 1
16 11 26
How to create a message will be described by an example given below.
Example) Reading a measured data for LT830 controller with “slave address 02”.
